Ditto on the doing food prep / latrine away from where you will be sleeping. As many have suggested, cook, eat, move on and camp for the night.

A bear bag will probably be your most viable solution when being concerned for weight.

A few years back I was camping with the scouts. One troop was told to put a garbage bag at the end of their cots for their wrappers and such. Well, a bear came into one tent, pushed a kid out of the way (giving him a pretty good gash on the side of their head) and grabbed their footlocker that had food in it. Tons of things were done wrong in that scenario.